ELBOW AS 1488356 - Caterpillar

The Electronic Control Module (ECM) monitors the intake manifold air for excessive temperature. The following codes are associated with high intake manifold air temperature:
Table 1
Diagnostic Codes for High Intake Manifold Air Temperature    
J1939 Code    Code Description    Comments    
105-15     Engine Intake Manifold #1 Temperature : High - least severe (1)     The engine has been running for 3 minutes.
No other 105 codes are active.
168 codes are not active.
The intake manifold air temperature exceeds the value that is programmed into the ECM for 8 seconds. The code is logged.
This code will be reset when the temperature is less than
123° C (253° F) for 4 seconds.    
105-16     Engine Intake Manifold #1 Temperature : High - Moderate Severity (2)     The engine has been running for 3 minutes.
No other 105 codes are active.
168 codes are not active.
The intake manifold air temperature exceeds the value that is programmed into the ECM for 8 seconds. The engine will be derated. The code is logged.
This code will be reset when the temperature is less than
125° C (257° F) for 20 seconds.    Probable Causes
Coolant level
Cooling fan (if applicable)
Air inlet and exhaust system
Ambient temperature
Running conditionRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Coolant Level
A. Check that the coolant is filled to the correct level.
Note: If the coolant level is too low, air will get into the cooling system. Air in the cooling system will cause a reduction in coolant flow.
   
Coolant
   
Result: The coolant level is low.
Fill the coolant system to the correct level. Refer to the Operation and Maintenance Manual, "Coolant Level - Check".
Result: The coolant level is OK.
Proceed to Test Step 2.
   
2. Cooling Fan (If Applicable)
A. Check the cooling fan for damage.
Note: A damaged fan t can result in insufficient airflow over the engine.
   
Cooling fan
   
Result: The cooling fan is damaged.
Repair or replace the cooling fan.
Result: The cooling fan is OK.
Proceed to Test Step 3.
   
3. Air Intake and Exhaust System
A. Check the air intake and exhaust system for the following defects:
Blockages
Restrictions
Damage to the air intake ducts and hoses
Loose connections and air leaks
   
Air intake and exhaust
   
Result: The air intake or exhaust system is blocked, restricted, damaged, or loose.
Make all necessary repairs to the air intake system.
Result: The air intake and exhaust system is OK.
For applications with a raw water cooling system or a keel cooled cooling system, proceed to Test Step 4.
For applications with a radiator cooling system, proceed to Test Step 6.
   
4. Check for an Obstructed Heat Exchanger
A. The intake manifold air temperature can increase if the flow through the heat exchanger is obstructed. Check the heat exchanger for obstructions or debris. Ensure that the flow of coolant through the heat exchanger is adequate.
   
Obstructed heat exchanger
   
Result: The heat exchanger was obstructed.
Clear any obstructions. Return the unit to service.
Result: The heat exchanger was not obstructed.
Proceed to Test Step 5.
   
5. Check the Flow